Wrist exerciser



FIG. 1 is a left side elevational view;

FIG. 2 is a right side elevational view;

FIG. 3 is a top plan view;

FIG. 4 is a bottom plan view;

FIG. 5 is a rear elevational view;

FIG. 6 is a front elevational view;

FIG. 7 is a left side elevational view, wherein the broken line showing of the hand is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a wrist exerciser, as shown and described. 